Mercurial > hg > blitz_condensed
annotate src/org/dancres/blitz/remote/view/EntryViewFactory.java @ 22:b7e52953b7a6
Add some cache/memory statistics to help spot potential exhaustion and other tuning issues.
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Fri, 28 Aug 2009 17:23:33 +0100 |
parents | d3ec5ebc3dba |
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rev | line source |
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0
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1 package org.dancres.blitz.remote.view; |
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2 |
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3 import java.io.IOException; |
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4 |
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5 import java.util.HashMap; |
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6 |
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7 import java.util.logging.Logger; |
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8 import java.util.logging.Level; |
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9 |
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10 import net.jini.id.Uuid; |
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11 import net.jini.id.UuidFactory; |
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12 |
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13 import net.jini.config.ConfigurationException; |
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14 |
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15 import net.jini.core.transaction.Transaction; |
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16 import net.jini.core.transaction.TransactionException; |
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17 |
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18 import org.dancres.blitz.EntryView; |
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19 import org.dancres.blitz.SpaceImpl; |
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20 |
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21 import org.dancres.blitz.mangler.MangledEntry; |
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22 |
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23 import org.dancres.blitz.lease.LeaseReaper; |
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24 import org.dancres.blitz.lease.Reapable; |
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25 import org.dancres.blitz.lease.ReapFilter; |
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26 |
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27 import org.dancres.blitz.util.Time; |
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28 |
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29 import org.dancres.blitz.Logging; |
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30 |
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31 import org.dancres.blitz.config.ConfigurationFactory; |
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32 |
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33 /** |
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34 Manages and tracks current <code>EntryView</code> instances instantiated |
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35 from a <code>SpaceImpl</code> instance. In particular it assigns those |
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36 instances a unique id and handles leasing aspects. |
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37 */ |
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38 public class EntryViewFactory implements Reapable { |
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39 private static Logger theLogger = |
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40 Logging.newLogger("org.dancres.blitz.remote.view.EntryViewFactory"); |
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41 |
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42 private static EntryViewFactory theFactory = new EntryViewFactory(); |
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43 |
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44 public static EntryViewFactory get() { |
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45 return theFactory; |
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46 } |
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47 |
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48 private HashMap theActiveViews = new HashMap(); |
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49 |
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50 private LeaseReaper theReaper; |
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51 |
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52 private boolean shouldUpdate; |
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53 |
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54 private EntryViewFactory() { |
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55 try { |
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56 long myReapInterval = |
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57 ((Long) ConfigurationFactory.getEntry("viewReapInterval", |
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58 long.class, |
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59 new Long(30 * 60 * 1000))).longValue(); |
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60 theReaper = new LeaseReaper("View", null, myReapInterval); |
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61 |
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62 theReaper.add(this); |
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63 |
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64 shouldUpdate = ((Boolean) |
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65 ConfigurationFactory.getEntry("updateContents", |
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66 boolean.class, |
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67 new Boolean(true))).booleanValue(); |
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68 |
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69 } catch (ConfigurationException aCE) { |
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70 theLogger.log(Level.SEVERE, "Failed to load config", aCE); |
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71 } |
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72 } |
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73 |
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74 public ViewRegistration newView(MangledEntry[] aTemplates, Transaction aTxn, |
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75 boolean holdLocks, long aLeaseDuration, |
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76 long aLimit, SpaceImpl aSpace) |
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77 throws IOException, TransactionException { |
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78 |
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79 // Hold locks should only stick for a non-null transaction, other |
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80 // wise we're just testing.... |
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81 |
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82 EntryView myView = aSpace.getView(aTemplates, aTxn, holdLocks, |
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83 shouldUpdate, aLimit); |
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84 |
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85 EntryViewUID myUid = new EntryViewUID(UuidFactory.generate()); |
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86 |
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87 long myExpiry = Time.getAbsoluteTime(aLeaseDuration); |
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88 |
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89 synchronized(this) { |
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90 theActiveViews.put(myUid, new ViewHolder(myView, myExpiry)); |
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91 } |
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92 |
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93 return new ViewRegistration(myUid, myExpiry); |
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94 } |
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95 |
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96 public EntryView getView(EntryViewUID aUID) { |
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97 |
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98 synchronized(this) { |
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99 ViewHolder myHolder = (ViewHolder) theActiveViews.get(aUID); |
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100 |
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101 if ((myHolder == null) || |
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102 (myHolder.hasExpired(System.currentTimeMillis()))) { |
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103 |
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104 return null; |
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105 } else { |
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106 return myHolder.getView(); |
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107 } |
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108 } |
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109 } |
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110 |
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111 public EntryView delete(EntryViewUID aUID) { |
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112 |
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113 synchronized(this) { |
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114 ViewHolder myHolder = (ViewHolder) theActiveViews.remove(aUID); |
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115 |
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116 if (myHolder != null) { |
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117 myHolder.getView().close(); |
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118 return myHolder.getView(); |
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119 } |
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120 |
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121 return null; |
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122 } |
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123 } |
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124 |
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125 /** |
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126 @todo Fix up the missing synchronization inside the loop (should be around the get and expire test) |
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127 */ |
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128 public void reap(ReapFilter aFilter) { |
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129 /* |
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130 No reap filters will be configured so we can ignore those - see |
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131 initialization in constructor |
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132 */ |
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133 long myTime = System.currentTimeMillis(); |
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134 |
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135 Object[] myKeys; |
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136 |
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137 synchronized(this) { |
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138 myKeys = theActiveViews.keySet().toArray(); |
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139 } |
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140 |
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141 for (int i = 0; i < myKeys.length; i++) { |
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142 ViewHolder myHolder = |
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143 (ViewHolder) theActiveViews.get(myKeys[i]); |
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144 |
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145 if (myHolder.hasExpired(myTime)) { |
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146 delete((EntryViewUID) myKeys[i]); |
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147 } |
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148 } |
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149 } |
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150 |
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151 /* *********************************************************************** |
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152 * Lease renewal/cancel |
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153 * ***********************************************************************/ |
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154 |
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155 boolean renew(EntryViewUID aUID, long anExpiry) { |
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156 synchronized(this) { |
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157 ViewHolder myHolder = (ViewHolder) theActiveViews.get(aUID); |
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158 |
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159 if (myHolder != null) { |
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160 return myHolder.testAndSetExpiry(System.currentTimeMillis(), |
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161 anExpiry); |
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162 } |
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163 |
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164 return false; |
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165 } |
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166 } |
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167 |
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168 boolean cancel(EntryViewUID aUID) { |
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169 return (delete(aUID) != null); |
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170 } |
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171 |
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172 class ViewHolder { |
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173 private long theExpiry; |
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174 private EntryView theView; |
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175 |
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176 ViewHolder(EntryView aView, long anExpiry) { |
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177 theView = aView; |
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178 theExpiry = anExpiry; |
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179 } |
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180 |
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181 boolean hasExpired(long aTime) { |
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182 return (theExpiry < aTime); |
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183 } |
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184 |
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185 boolean testAndSetExpiry(long aTime, long anExpiry) { |
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186 if (theExpiry < aTime) |
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187 return false; |
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188 |
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189 theExpiry = anExpiry; |
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190 |
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191 return true; |
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192 } |
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193 |
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194 EntryView getView() { |
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195 return theView; |
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196 } |
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197 } |
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198 } |